I assume that charghwI’ was responding to this post when Marc Okrand was asked how to say "a fast ship":

 

(MO, qepHom 2012 [via Lieven 11/22/2012]):  Maltz was unaware of an adjective meaning “fast” (or “slow” for that matter). He said in Klingon you wouldn't say that something is fast - you'd say it moves fast. So instead of “You have a fast ship”, you could say {nom leng DujlIj} “Your ship travels fast” or {nom leng Duj Daghajbogh} “The ship that you have travels fast.” If “your fast ship” is supposed to be the subject or object of a sentence, you say something like {tInqu' nom lengbogh DujlIj} “Your ship that travels fast is very big” (or, less literally, “Your fast ship is very big”) or {nom lengbogh DujlIj vIlegh} “I see your ship that travels fast” (or “I see your fast ship”).

Presumably this method works for slow ships as well.  <g>

I didn't remember this bit of canon, but this was going to be my response as well. The only time the lack of a verb for be fast is a problem is when you want to compare speeds — nom leng travel fast doesn't fit into the Q of a comparative. But otherwise, there is really no issue here. A fast ship is a nom lengbogh Duj or a nom vIHbogh Duj. To say That ship is fast, say nom leng Dujvetlh or nom vIH Dujvetlh or something like that. And the verb you attach nom to doesn't have to be leng or vIH. You could say nom nIn natlhbogh QuQ gas-guzzling engine and nom bumbogh nav va'chum fast-absorbing paper towel (nom woHbogh woHwI'!).

And of course it works for slow as well. In fact, it works for most adverbials.

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